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Nest humidity sensor - is it accurate?

Posted on 3/3/16 at 12:52 pm
Posted by VanRIch
Wherever
Member since Sep 2007
10953 posts
Posted on 3/3/16 at 12:52 pm
So 7 month old brand new house. Installed the nest thermostats. Humidity is consistently reading between 50-55%. Are my AC units improperly sized or do I need to look at getting a dedicated sensor? What can I check for to see if the humidity is indeed too high?
Posted by SERVON225LLT
Baton Rouge, LA
Member since Jun 2010
287 posts
Posted on 3/3/16 at 1:30 pm to
That is a good range
Posted by mctiger1985
Baton Rouge
Member since Oct 2009
3693 posts
Posted on 3/3/16 at 2:00 pm to
Ive noticed my nest was usually in line with my humidifier.
Posted by WavinWilly
Wavin Away in Sharlo
Member since Oct 2010
8826 posts
Posted on 3/3/16 at 2:04 pm to
Mine has been pretty accurate.

I did notice when I first got my nest, the house was a little more humid, but the temp was the same. I'm guessing because the AC ran less often throughout the actual day that the AC didn't suck some humidity out of the air.
Posted by The Last Coco
On the water
Member since Mar 2009
6864 posts
Posted on 3/3/16 at 3:59 pm to
quote:

Humidity is consistently reading between 50-55%

That's perfect. Why would you be concerned?

You can buy a cheap humidistat at lowe's if you want to verify it. AccuRite makes one that I use in my basement just to double check that my dehumidifier is operating correctly. It nearly perfectly mirrors the read out on my dehumidifier so I trust it.
Posted by VanRIch
Wherever
Member since Sep 2007
10953 posts
Posted on 3/3/16 at 4:37 pm to
Oh I thought I read somewhere that 35-40 was ideal and anything above 45 you may have mold issues.

ETA: This is what I remember reading.
This post was edited on 3/3/16 at 4:40 pm
Posted by mctiger1985
Baton Rouge
Member since Oct 2009
3693 posts
Posted on 3/3/16 at 5:49 pm to
Anything below 40 messes my sinuses up while i sleep
Posted by ArkLaTexTiger
Houston
Member since Nov 2009
2536 posts
Posted on 3/3/16 at 7:45 pm to
Does your A/C have direct humidity control? If so, look at the setpoint.

A study out a few years ago recommended 35 - 50% as optimum for human health. I'll see if I can find it.
Posted by 10Percenter
Member since Feb 2009
1925 posts
Posted on 3/3/16 at 8:55 pm to
Your humidity level is a tad on the high side but still ok. You would have to actually get a smaller ton unit to lower the humidity level. An a/c conditions the air while in use, thus takes moisture out the air. A unit that runs more frequently will condtion the air more adequately(lower humidity) than one that is oversized that cools quick then stops.
Posted by 10Percenter
Member since Feb 2009
1925 posts
Posted on 3/3/16 at 8:58 pm to
The biggest misconception is a unit that runs often is undersized. Likely it is ideal, given some exceptions.
Posted by SERVON225LLT
Baton Rouge, LA
Member since Jun 2010
287 posts
Posted on 3/4/16 at 8:58 am to
Posted by ArkLaTexTiger
Houston
Member since Nov 2009
2536 posts
Posted on 3/5/16 at 8:41 am to
That's the chart I remembered but had the incorrect ideal range.

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